From: Limin Wang <lance.lmw...@gmail.com>
I have samples failed to detect the freeze frame with the default -60dB
noise(-40dB is OK to detect),
after apply the patch, it's ok to detect.
I run the testing with fate-suite sample for your testing:
old:
no freeze frame detect.
with the patch:
./ffmpeg -i fate-suite/svq3/Vertical400kbit.sorenson3.mov -vf
freezedetect=n=-60dB -an -f null -
[freezedetect @ 0x7fe18a604900] lavfi.freezedetect.freeze_start: 38.7667
[freezedetect @ 0x7fe18a604900] lavfi.freezedetect.freeze_duration: 2.5
[freezedetect @ 0x7fe18a604900] lavfi.freezedetect.freeze_end: 41.2667
[freezedetect @ 0x7fe18a604900] lavfi.freezedetect.freeze_start: 41.2667
Have run make fate testing although haven't find any freezedetect checking for
the fate.
Signed-off-by: Limin Wang <lance.lmw...@gmail.com>
---
libavfilter/vf_freezedetect.c | 22 ++++++++++++++++------
1 file changed, 16 insertions(+), 6 deletions(-)
diff --git a/libavfilter/vf_freezedetect.c b/libavfilter/vf_freezedetect.c
index cc086af..0288fb0 100644
--- a/libavfilter/vf_freezedetect.c
+++ b/libavfilter/vf_freezedetect.c
@@ -38,7 +38,9 @@ typedef struct FreezeDetectContext {
ptrdiff_t height[4];
ff_scene_sad_fn sad;
int bitdepth;
+ int nb_planes;
AVFrame *reference_frame;
+ double prev_mafd;
int64_t n;
int64_t reference_n;
int frozen;
@@ -102,13 +104,15 @@ static int config_input(AVFilterLink *inlink)
AVFilterContext *ctx = inlink->dst;
FreezeDetectContext *s = ctx->priv;
const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
+ int vsub = pix_desc->log2_chroma_h;
s->bitdepth = pix_desc->comp[0].depth;
+ s->nb_planes = av_pix_fmt_count_planes(inlink->format);
- for (int plane = 0; plane < 4; plane++) {
+ for (int plane = 0; plane < s->nb_planes; plane++) {
ptrdiff_t line_size = av_image_get_linesize(inlink->format, inlink->w,
plane);
- s->width[plane] = line_size >> (s->bitdepth > 8);
- s->height[plane] = inlink->h >> ((plane == 1 || plane == 2) ?
pix_desc->log2_chroma_h : 0);
+ s->width[plane] = line_size;
+ s->height[plane] = plane == 1 || plane == 2 ?
AV_CEIL_RSHIFT(inlink->h, vsub) : inlink->h;
}
s->sad = ff_scene_sad_get_fn(s->bitdepth == 8 ? 8 : 16);
@@ -129,7 +133,9 @@ static int is_frozen(FreezeDetectContext *s, AVFrame
*reference, AVFrame *frame)
uint64_t sad = 0;
uint64_t count = 0;
double mafd;
- for (int plane = 0; plane < 4; plane++) {
+ double diff, cmp;
+
+ for (int plane = 0; plane < s->nb_planes; plane++) {
if (s->width[plane]) {
uint64_t plane_sad;
s->sad(frame->data[plane], frame->linesize[plane],
@@ -140,8 +146,12 @@ static int is_frozen(FreezeDetectContext *s, AVFrame
*reference, AVFrame *frame)
}
}
emms_c();
- mafd = (double)sad / count / (1ULL << s->bitdepth);
- return (mafd <= s->noise);
+ mafd = (double)sad /(count >> (s->bitdepth > 8));
+ diff = fabs(mafd - s->prev_mafd);
+ cmp = av_clipf(FFMIN(mafd, diff) / 100., 0, 1);
+ s->prev_mafd = mafd;
+
+ return (cmp <= s->noise);
}
static int set_meta(FreezeDetectContext *s, AVFrame *frame, const char *key,
const char *value)
--
2.6.4
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